Canuel, E. A.. Virginia Institute of Marine Science, firstname.lastname@example.org
, . A.. ,
SOURCES OF SUSPENDED AND SEDIMENTARY PARTICULATE ORGANIC MATTER IN THE CHESAPEAKE BAY
Estuaries are characterize by abundant and diverse sources of organic matter. In this study, lipid biomarker compounds (fatty acids and sterols) were used to examine spatial and temporal variability in the sources of particulate organic matter (POM) important to the Chesapeake Bay (CB). The objectives of the study were twofold: (1) use biomarker distributions associated with suspended particles to evaluate the composition of POM at short time scales and (2) collect surficial sediments to provide a more integrated view of organic matter composition. Sites were selected to represent the ocean and freshwater end members, as well as mid-Bay, estuarine conditions. The suspended particle and sediment samples were collected under varying environmental conditions.
Overall, sterol and fatty acid distributions from mid- and south-Bay sites reflect the dominance of phytoplankton derived organic matter and enrichments of these components occurred during the Spring Bloom. Terrigenous and/or seagrass/marshgrass sources of organic matter make-up a small fraction of the POC at these sites but were elevated at a site proximate to the mouth of the Susquehanna River. Signatures of biomarkers indicative of bacterial and vascular plant sources are enriched in the sediments relative to the suspended particles.
Day: Thursday, Feb. 4
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